Buggy code:
public class URI implements Serializable { public static class MalformedURIException extends IOException { public MalformedURIException ( ) { } public MalformedURIException ( String p_msg ) { } } private static final byte [ ] fgLookupTable = new byte [ 128 ] ; private static final int RESERVED_CHARACTERS = 1 ; private static final int MARK_CHARACTERS = 2 ; private static final int SCHEME_CHARACTERS = 4 ; private static final int USERINFO_CHARACTERS = 8 ; private static final int ASCII_ALPHA_CHARACTERS = 16 ; private static final int ASCII_DIGIT_CHARACTERS = 32 ; private static final int ASCII_HEX_CHARACTERS = 64 ; private static final int PATH_CHARACTERS = 128 ; private static final int MASK_ALPHA_NUMERIC = ( URI . ASCII_ALPHA_CHARACTERS ) | ( URI . ASCII_DIGIT_CHARACTERS ) ; private static final int MASK_UNRESERVED_MASK = ( URI . MASK_ALPHA_NUMERIC ) | ( URI . MARK_CHARACTERS ) ; private static final int MASK_URI_CHARACTER = ( URI . MASK_UNRESERVED_MASK ) | ( URI . RESERVED_CHARACTERS ) ; private static final int MASK_SCHEME_CHARACTER = ( URI . MASK_ALPHA_NUMERIC ) | ( URI . SCHEME_CHARACTERS ) ; private static final int MASK_USERINFO_CHARACTER = ( URI . MASK_UNRESERVED_MASK ) | ( URI . USERINFO_CHARACTERS ) ; private static final int MASK_PATH_CHARACTER = ( URI . MASK_UNRESERVED_MASK ) | ( URI . PATH_CHARACTERS ) ; private String m_scheme = null ; private String m_userinfo = null ; private String m_host = null ; private int m_port = - 1 ; private String m_regAuthority = null ; private String m_path = null ; private String m_queryString = null ; private String m_fragment = null ; private static boolean DEBUG = false ; public URI ( ) { } public URI ( URI p_other ) { } public URI ( String p_uriSpec ) throws URI . MalformedURIException { } public URI ( URI p_base , String p_uriSpec ) throws URI . MalformedURIException { } public URI ( String p_scheme , String p_schemeSpecificPart ) throws URI . MalformedURIException { } public URI ( String p_scheme , String p_host , String p_path , String p_queryString , String p_fragment ) throws URI . MalformedURIException { } public URI ( String p_scheme , String p_userinfo , String p_host , int p_port , String p_path , String p_queryString , String p_fragment ) throws URI . MalformedURIException { } private void initialize ( URI p_other ) { } private void initialize ( URI p_base , String p_uriSpec ) throws URI . MalformedURIException { <START_BUG> String uriSpec = ( p_uriSpec != null ) ? p_uriSpec . trim ( ) : null ; <END_BUG> int uriSpecLen = ( uriSpec != null ) ? uriSpec . length ( ) : 0 ; if ( ( p_base == null ) && ( uriSpecLen == 0 ) ) { throw new URI . MalformedURIException ( "Cannot<seq2seq4repair_space>initialize<seq2seq4repair_space>URI<seq2seq4repair_space>with<seq2seq4repair_space>empty<seq2seq4repair_space>parameters." ) ; } if ( uriSpecLen == 0 ) { initialize ( p_base ) ; return ; } int index = 0 ; int colonIdx = uriSpec . indexOf ( ':' ) ; int slashIdx = uriSpec . indexOf ( '//' ) ; int queryIdx = uriSpec . indexOf ( '?' ) ; int fragmentIdx = uriSpec . indexOf ( '#' ) ; if ( ( ( ( colonIdx < 2 ) || ( ( colonIdx > slashIdx ) && ( slashIdx != ( - 1 ) ) ) ) || ( ( colonIdx > queryIdx ) && ( queryIdx != ( - 1 ) ) ) ) || ( ( colonIdx > fragmentIdx ) && ( fragmentIdx != ( - 1 ) ) ) ) { if ( ( colonIdx == 0 ) || ( ( p_base == null ) && ( fragmentIdx != 0 ) ) ) { throw new URI . MalformedURIException ( "No<seq2seq4repair_space>scheme<seq2seq4repair_space>found<seq2seq4repair_space>in<seq2seq4repair_space>URI." ) ; } } else { initializeScheme ( uriSpec ) ; index = ( m_scheme . length ( ) ) + 1 ; if ( ( colonIdx == ( uriSpecLen - 1 ) ) || ( ( uriSpec . charAt ( ( colonIdx + 1 ) ) ) == '#' ) ) { throw new URI . MalformedURIException ( "Scheme<seq2seq4repair_space>specific<seq2seq4repair_space>part<seq2seq4repair_space>cannot<seq2seq4repair_space>be<seq2seq4repair_space>empty." ) ; } } if ( ( ( index + 1 ) < uriSpecLen ) && ( ( ( uriSpec . charAt ( index ) ) == '//' ) && ( ( uriSpec . charAt ( ( index + 1 ) ) ) == '//' ) ) ) { index += 2 ; int startPos = index ; char testChar = '' ; while ( index < uriSpecLen ) { testChar = uriSpec . charAt ( index ) ; if ( ( ( testChar == '//' ) || ( testChar == '?' ) ) || ( testChar == '#' ) ) { break ; } index ++ ; } if ( index > startPos ) { if ( ! ( initializeAuthority ( uriSpec . substring ( startPos , index ) ) ) ) { index = startPos - 2 ; } } else { m_host = "" ; } } initializePath ( uriSpec , index ) ; if ( p_base != null ) { if ( ( ( ( ( m_path . length ( ) ) == 0 ) && ( ( m_scheme ) == null ) ) && ( ( m_host ) == null ) ) && ( ( m_regAuthority ) == null ) ) { m_scheme = p_base . getScheme ( ) ; m_userinfo = p_base . getUserinfo ( ) ; m_host = p_base . getHost ( ) ; m_port = p_base . getPort ( ) ; m_regAuthority = p_base . getRegBasedAuthority ( ) ; m_path = p_base . getPath ( ) ; if ( ( m_queryString ) == null ) { m_queryString = p_base . getQueryString ( ) ; } return ; } if ( ( m_scheme ) == null ) { m_scheme = p_base . getScheme ( ) ; } else { return ; }

Fix:
String uriSpec = p_uriSpec ;